Abstract
Auditory adaptation was determined four observers to 100-, 1000-, and 4000-cps tones at 30-, 50-, 70-, and 90-db loudness level. The spread of effect to closely adjacent frequencies was particularly examined. The method of adaptation was used to avoid the intrusion of beats in the simultaneous masking experiment. Loudness patterns were drawn according to the method of Munson and Gardner, confirming and extending the earlier study. Within the region represented by the differential threshold, no especial peaking of the loudness pattern was found. For example, at 1000 cps, there was broad peak of ±10 cps. From earlier experiments, adaptation is thought to be confined to the peripheral sense organ. According to this view, the present data would represent a stage in the process of handling frequency information, intermediate between the much broader amplitude patterns and the more precise operations the command of the nervous system.
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